[INFO] cloning repository https://github.com/jmatta697/matta_bc
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/jmatta697/matta_bc" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fjmatta697%2Fmatta_bc", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fjmatta697%2Fmatta_bc'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 3ead6621c2c413d844175868839063592f32468c
[INFO] checking jmatta697/matta_bc against try#6f12b8fe67b4eed2e838dab803ed9493b9d62c0f for pr-79073
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fjmatta697%2Fmatta_bc" "/workspace/builds/worker-1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-1/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/jmatta697/matta_bc on toolchain 6f12b8fe67b4eed2e838dab803ed9493b9d62c0f
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+6f12b8fe67b4eed2e838dab803ed9493b9d62c0f" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/jmatta697/matta_bc
[INFO] finished tweaking git repo https://github.com/jmatta697/matta_bc
[INFO] tweaked toml for git repo https://github.com/jmatta697/matta_bc written to /workspace/builds/worker-1/source/Cargo.toml
[INFO] crate git repo https://github.com/jmatta697/matta_bc already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+6f12b8fe67b4eed2e838dab803ed9493b9d62c0f" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "rustops/crates-build-env@sha256:6eabd152ff4036248d66efda456a36cb33d24b7291b33f25f75140726c88da35" "/opt/rustwide/cargo-home/bin/cargo" "+6f12b8fe67b4eed2e838dab803ed9493b9d62c0f" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] fef85cd6f72c3d69a5b14100049c86abaa7f3a825e515c48ddd24a4e1635657e
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `Command { std: "docker" "start" "-a" "fef85cd6f72c3d69a5b14100049c86abaa7f3a825e515c48ddd24a4e1635657e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "fef85cd6f72c3d69a5b14100049c86abaa7f3a825e515c48ddd24a4e1635657e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "fef85cd6f72c3d69a5b14100049c86abaa7f3a825e515c48ddd24a4e1635657e", kill_on_drop: false }`
[INFO] [stdout] fef85cd6f72c3d69a5b14100049c86abaa7f3a825e515c48ddd24a4e1635657e
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "rustops/crates-build-env@sha256:6eabd152ff4036248d66efda456a36cb33d24b7291b33f25f75140726c88da35" "/opt/rustwide/cargo-home/bin/cargo" "+6f12b8fe67b4eed2e838dab803ed9493b9d62c0f" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] 371a8957925842ca05b5e0f31f2391fb9e9809166f3100a0d5c94cbac2b92c89
[INFO] running `Command { std: "docker" "start" "-a" "371a8957925842ca05b5e0f31f2391fb9e9809166f3100a0d5c94cbac2b92c89", kill_on_drop: false }`
[INFO] [stderr]     Checking libc v0.2.43
[INFO] [stderr]    Compiling regex v1.0.6
[INFO] [stderr]     Checking utf8-ranges v1.0.2
[INFO] [stderr]    Compiling memchr v2.1.1
[INFO] [stderr]     Checking regex-syntax v0.6.3
[INFO] [stderr]     Checking thread_local v0.3.6
[INFO] [stderr]     Checking aho-corasick v0.6.9
[INFO] [stderr]     Checking matta_bc v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: value assigned to `variable_value_str` is never read
[INFO] [stdout]    --> src/main.rs:424:9
[INFO] [stdout]     |
[INFO] [stdout] 424 |     let mut variable_value_str = String::new();
[INFO] [stdout]     |         ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_assignments)]` on by default
[INFO] [stdout]     = help: maybe it is overwritten before being read?
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `variable_value_str` is never read
[INFO] [stdout]    --> src/main.rs:424:9
[INFO] [stdout]     |
[INFO] [stdout] 424 |     let mut variable_value_str = String::new();
[INFO] [stdout]     |         ^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_assignments)]` on by default
[INFO] [stdout]     = help: maybe it is overwritten before being read?
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 8.76s
[INFO] running `Command { std: "docker" "inspect" "371a8957925842ca05b5e0f31f2391fb9e9809166f3100a0d5c94cbac2b92c89", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "371a8957925842ca05b5e0f31f2391fb9e9809166f3100a0d5c94cbac2b92c89", kill_on_drop: false }`
[INFO] [stdout] 371a8957925842ca05b5e0f31f2391fb9e9809166f3100a0d5c94cbac2b92c89